No shame in being a beginner! However, I would definitely recommend against using satin, especially
if you're a beginner. Sarcasm-Hime
's has a nicely summarized reason why (look under #3). For a costume like the one you want to do, I would recommend using knit fabric, because that way you can get it more form fitting. Not only would satin not before as form fitting, but I also don't think it would hang right for this particular costume.
As for props...well, I'm still learning those myself, so I can't help too much there. You could probably get away with crayola model magic for some of the smaller pieces. For her (looks like) jet packs, maybe get some foam from a hardware store and go that route. Definitely look up some prop tutorials first online and figure out a plan before you buy anything.